Table 1. Optimization Parameters and Levels of PBD (Number of Numeric Factors: 5; Number of Categorical Factors: 2; and Number of Levels: 2).

factor	factor code	type	low level	high level
pH	A	numeric	2	4
agitation speed (rpm)	B	numeric	100	200
amount of adsorbent (mg)	C	numeric	100	1000
temperature (°C)	D	numeric	25	45
contact time (min)	E	numeric	2	20
type of the adsorbent	F	categoric	hydrogel	cryogel
GA cross-linking	G	categoric		+